What this MCCB brings to a dusty control room
The Siemens SENTRON 3VA2163-6HN36-0DH0 is a 3-pole molded case circuit breaker rated for 63 A continuous current at 40 °C, with an ETU350 electronic trip unit and an integrated undervoltage release. It carries a 242 kA interrupting rating at 240 V, which drops to 187 kA at 415 V and 440 V, then to 121 kA at 500 V, and finally to 5 kA at 690 V — so the SCCR you need for your feeder panel depends entirely on the line voltage. The rated insulation voltage is 800 V, meaning the internal clearances and creepage are designed for 690 V systems with margin. This is a line-protection version — no communication module, no ground-fault monitoring, no phase-failure detection. It is a straightforward thermal-magnetic replacement with an electronic trip curve, built to sit in a main distribution board or a large MCC bucket where selectivity and high fault current are the concern, not fieldbus integration.
What the ratings mean for fit
The 63 A rating holds flat from 40 °C to 50 °C, then derates to 60.6 A at 55 °C, 58.3 A at 60 °C, 55.9 A at 65 °C, and 53.6 A at 70 °C. If your panel ambient runs above 50 °C — common in cement plant control rooms near the kiln — you lose about 9 A by 70 °C. Size the breaker for the actual load at the enclosure ambient, not the nameplate 63 A. The auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm switch (HQ type). The integrated undervoltage release (UVR) is factory-installed, part of the basic switch assembly 3VA2163-6HN36-0AA0, and the auxiliary trip module is 3VA9608-0BB25. If your safety circuit requires a shunt trip or a different UVR coil voltage, this variant is already set — verify the coil rating against your control voltage before wiring. Dimensions are 105 mm wide, 181 mm high, 86 mm deep. That 105 mm width is three-pole standard for this frame size; it occupies the same footprint as other SENTRON 3VA2 breakers. The operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C, so it handles outdoor storage in a northern winter or a hot roof without issue. Maximum power loss is 6.5 W — negligible for panel heat load calculations, but worth noting if you are packing dozens of these into a sealed enclosure.